Casey from SWISCO responded:
June 13, 2022
Hello, Take a look at the 15-253 triple support, which uses the S160 coil springs. Based on your 2505 stamp, you'll most likely need two of the S160-9 and one S160-7 coil on each side of the window. With that being said, I would recommend weighing your sash to confirm that it weighs 51 pounds to ensure that these coils will support your sash. Thank you! |
Casey from SWISCO responded:
July 5, 2022
Great, then you can add double the amount of parts to your cart so that you'll be able to replace the balance assembly on both sides. You are also welcome to give our customer service team a call at (888) 991-1929 and one of our representatives will be happy to assist you. |